An investigation was made of the isotopic exchange reaction, between RbCl and Cl, by using 36Cl as tracer. It was found that the data, for temperatures ranging from 200 to 400C, could be described by:

D (cm2/s) = 3.37 x 10-5 exp[-31(kcal/mol)/RT]

T.Takaishi, Y.Sensui: Transactions of the Faraday Society, 1969, 65, 131-8